| Identifier | Protein names | Gene names | Cross reference refseq | Length | Species |
| P30147 | Hydroxypyruvate isomerase; EC 5.3.1.22; Glyoxylate-induced protein; | hyi; gip ybbG; b0508 JW0496; | NP_415041.1;YP_488798.1; | 258 | escherichia-coli |
| P77858 | Hydrogenase-4 component C; EC 1.-.-.-; | hyfC; b2483 JW2468; | NP_416978.4;YP_490711.1; | 315 | escherichia-coli |
| P0A700 | Protein HypA; | hypA; b2726 JW2696; | NP_417206.1;YP_490935.1; | 116 | escherichia-coli |
| P0AAN3 | Hydrogenase isoenzymes nickel incorporation protein HypB; | hypB; b2727 JW2697; | NP_417207.1;YP_490936.1; | 290 | escherichia-coli |
| P24192 | Hydrogenase isoenzymes formation protein HypD; | hypD; b2729 JW2699; | NP_417209.1;YP_490938.1; | 373 | escherichia-coli |
| P0AAM3 | Hydrogenase isoenzymes formation protein HypC; | hypC; b2728 JW2698; | NP_417208.1;YP_490937.1; | 90 | escherichia-coli |
| P24193 | Hydrogenase isoenzymes formation protein HypE; | hypE; b2730 JW2700; | NP_417210.2;YP_490939.1; | 336 | escherichia-coli |
| P30131 | Carbamoyltransferase HypF; EC 2.1.3.-; Carbamoyl phosphate-converting enzyme HypF; [NiFe]-hydrogenase maturation factor HypF; Hydrogenase maturation protein HypF; | hypF; hydA; b2712 JW5433; | NP_417192.1;YP_490921.1; | 750 | escherichia-coli |
| P37595 | Isoaspartyl peptidase; EC 3.4.19.5; Beta-aspartyl-peptidase; EcAIII; Isoaspartyl dipeptidase; [Cleaved into: Isoaspartyl peptidase subunit alpha; Isoaspartyl peptidase subunit beta]; | iaaA; spt ybiK; b0828 JW0812; | NP_415349.1;YP_489101.1; | 321 | escherichia-coli |
| P39377 | Isoaspartyl dipeptidase; EC 3.4.19.-; | iadA; yjiF; b4328 JW4291; | NP_418748.1;YP_492462.1; | 390 | escherichia-coli |
| P10423 | Alkaline phosphatase isozyme conversion protein; EC 3.4.11.-; | iap; b2753 JW2723; | NP_417233.1;YP_490962.1; | 345 | escherichia-coli |
| P0A9W6 | Acid stress protein IbaG; | ibaG; yrbA; b3190 JW3157; | NP_417657.2;YP_491375.1; | 84 | escherichia-coli |
| P0C054 | Small heat shock protein IbpA; 16 kDa heat shock protein A; | ibpA; hslT htpN; b3687 JW3664; | NP_418142.1;YP_491748.1; | 137 | escherichia-coli |
| P0C058 | Small heat shock protein IbpB; 16 kDa heat shock protein B; | ibpB; hslS htpE; b3686 JW3663; | NP_418141.2;YP_491749.1; | 142 | escherichia-coli |
| C1P615 | Small toxic protein IbsC; | ibsC; b4665 JW2879.1; | YP_002791255.1; | 19 | escherichia-coli |
| C1P616 | Small toxic protein IbsD; | ibsD; b4664 JW3023.1; | YP_002791256.1; | 19 | escherichia-coli |
| C1P617 | Small toxic protein IbsE; | ibsE; b4666 JW3023.2; | YP_002791257.1; | 19 | escherichia-coli |
| C1P607 | Small toxic protein IbsA; | ibsA; b4667 JW2058.1; | YP_002791247.1; | 19 | escherichia-coli |
| C1P608 | Small toxic protein IbsB; | ibsB; b4668 JW2058.2; | YP_002791248.1; | 18 | escherichia-coli |
| P16528 | Acetate operon repressor; | iclR; b4018 JW3978; | NP_418442.2;YP_492161.1; | 274 | escherichia-coli |
